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Gearbox for a tap changer, a tap changer and a transformer

a technology for transformers and gearboxes, applied in gearboxes, mechanical instruments, discontinuously variable inductance/transformers, etc., can solve the problems of circumstantial driving and transmission devices for this, and achieve the effect of simple and reliabl

Active Publication Date: 2015-09-08
HITACHI ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a simple and reliable way to drive a tap changer using a single gearbox that converts movement to activate the switches and select arms at specific times. This gearbox is multifunctional and compact, with optimal rotational speed for different outputs, and synchronization of output movements. A driving wheel common to both the geneva drive shafts ensures consistent behavior of the selector arm drives relative to each other, and a well-defined orientation of the axes relative to each other contributes to a compact construction and well-adapted functions.

Problems solved by technology

The driving and transmission devices for this therefore tend to be quite circumstantial and complicated.

Method used

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  • Gearbox for a tap changer, a tap changer and a transformer
  • Gearbox for a tap changer, a tap changer and a transformer
  • Gearbox for a tap changer, a tap changer and a transformer

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Embodiment Construction

[0047]FIG. 1 schematically illustrates a tap changer 100 of a kind for which the gearbox according to the present invention is intended. The tap changer 100 is connected to a regulating winding 105 of a transformer and has a set of different taps 110. The tap changer of FIG. 1 is of diverter switch type, and comprises a diverter switch 115 and a tap selector 120.

[0048]The tap selector 120 of FIG. 1 comprises two current collectors 125, two selector arms forming two moveable contacts 130 and further comprises a set of fixed contacts 135, where, each fixed contact 135 is arranged to be connected to one of the taps 110 of the regulating winding. The tap changer 100 of FIG. 1 has fifteen different fixed contacts 135, and the regulating winding 105 has fifteen taps 110. The tap changer 100 of FIG. 1 is mechanically linear in the sense that the current collectors 125 are implemented as linear rods, and the fixed contacts 135 are arranged in a linear fashion. The two current collectors 125...

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Abstract

A gearbox for a tap changer. The gearbox has an input drive shaft arranged to be connected to a motor. The gearbox also has a diverter switch drive output with a diverter shaft. The diverter switch drive output is arranged to be connected for actuation of breakers in a diverter switch of the tap changer. The gearbox further has first and second selector arm drive outputs arranged for actuation of a tap selector of the tap changer. It also has reduction gear means connecting the input drive shaft to the diverter switch drive output and to each of the selector arm drive outputs. Further the gearbox has timing connection means arranged to connect the reduction gear means to each of the selector arm drive outputs. The invention also relates to a tap changer having such a gearbox and to a transformer provided with such a tap changer.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a gearbox for a tap changer, which gearbox has an input drive shaft arranged to be connected to a motor and includes a diverter switch drive output with a diverter shaft, which diverter switch drive output is arranged to be connected for actuation of breakers in a diverter switch of the tap changer.[0002]The invention also relates to a tap changer and to a transformer.BACKGROUND OF THE INVENTION[0003]A tap changer is commonly used in connection with a transformer in order to vary the transformation rate thereof. In a transformer with a tap changer one of the windings in the transformer has a fixed amount of turns connected to the circuit. The other winding has one fixed connection point, whereas the other connection point can be selected among a number of points to attain a required voltage. The selectable points may be located after each other along a portion of the winding corresponding to 70% to 100% of its full extensi...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F16H57/02H01H3/40H01H19/00H01F21/12H01H3/44H01H9/00F16H1/20F16H27/06H01F29/04
CPCF16H1/20H01H3/40H01H3/44H01H9/0027F16H27/06H01F29/04Y10T74/19642
Inventor MATHAE, JEAN
Owner HITACHI ENERGY LTD
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